CVE-2026-43314: dm: remove fake timeout to avoid leak request

Q: What is the severity of CVE-2026-43314?

CVE-2026-43314 has been classified with a medium severity level due to its potential impact on request leakage.

Q: How do I fix CVE-2026-43314?

To fix CVE-2026-43314, you should update the Linux kernel (device-mapper) to a patched version that eliminates the fake timeout issue.

Q: What types of systems are affected by CVE-2026-43314?

CVE-2026-43314 affects systems running the Linux kernel, specifically those utilizing the device-mapper.

Q: Is CVE-2026-43314 remotely exploitable?

CVE-2026-43314 is not considered remotely exploitable as it requires local access to the affected system.

Q: What potential impacts does CVE-2026-43314 pose?

CVE-2026-43314 could lead to unauthorized information disclosure due to request leakage if left unaddressed.

Published May 8, 2026

Updated

In the Linux kernel, the following vulnerability has been resolved:

dm: remove fake timeout to avoid leak request

Since commit 15f73f5b3e59 ("blk-mq: move failure injection out of blkmqcompleterequest"), drivers are responsible for calling blkshouldfaketimeout() at appropriate code paths and opportunities.

However, the dm driver does not implement its own timeout handler and relies on the timeout handling of its slave devices.

If an io-timeout-fail error is injected to a dm device, the request will be leaked and never completed, causing tasks to hang indefinitely.

Reproduce: 1. prepare dm which has iscsi slave device 2. inject io-timeout-fail to dm echo 1 >/sys/class/block/dm-0/io-timeout-fail echo 100 >/sys/kernel/debug/failiotimeout/probability echo 10 >/sys/kernel/debug/failiotimeout/times 3. read/write dm 4. iscsiadm -m node -u

Result: hang task like below [ 862.243768] INFO: task kworker/u514:2:151 blocked for more than 122 seconds. [ 862.244133] Tainted: G E 6.19.0-rc1+ #51 [ 862.244337] "echo 0 > /proc/sys/kernel/hungtasktimeoutsecs" disables this message. [ 862.244718] task:kworker/u514:2 state:D stack:0 pid:151 tgid:151 ppid:2 taskflags:0x4288060 flags:0x00080000 [ 862.245024] Workqueue: iscsictrl3:1 iscsiunbindsession [scsitransportiscsi] [ 862.245264] Call Trace: [ 862.245587] <TASK> [ 862.245814] schedule+0x810/0x15c0 [ 862.246557] schedule+0x69/0x180 [ 862.246760] blkmqfreezequeuewait+0xde/0x120 [ 862.247688] elevatorchange+0x16d/0x460 [ 862.247893] elevatorsetnone+0x87/0xf0 [ 862.248798] blkunregisterqueue+0x12e/0x2a0 [ 862.248995] delgendisk+0x231/0x7e0 [ 862.250143] delgendisk+0x12f/0x1d0 [ 862.250339] sdremove+0x85/0x130 [sdmod] [ 862.250650] devicereleasedriverinternal+0x36d/0x530 [ 862.250849] busremovedevice+0x1dd/0x3f0 [ 862.251042] devicedel+0x38a/0x930 [ 862.252095] scsiremovedevice+0x293/0x360 [ 862.252291] scsiremovetarget+0x486/0x760 [ 862.252654] iscsiunbindsession+0x18a/0x3e0 [scsitransportiscsi] [ 862.252886] processonework+0x633/0xe50 [ 862.253101] workerthread+0x6df/0xf10 [ 862.253647] kthread+0x36d/0x720 [ 862.254533] retfromfork+0x2a6/0x470 [ 862.255852] retfromforkasm+0x1a/0x30 [ 862.256037] </TASK>

Remove the blkshouldfaketimeout() check from dm, as dm has no native timeout handling and should not attempt to fake timeouts.

Affected Software

249 affected componentsFixes available

The Linux Foundation Linux kernel (device-mapper)

Linux Linux kernel>=2.6.31<5.10.252

Linux Linux kernel>=5.11<5.15.202

Linux Linux kernel>=5.16<6.1.165

Linux Linux kernel>=6.2<6.6.128

Linux Linux kernel>=6.7<6.12.75

Linux Linux kernel>=6.13<6.18.16

Linux Linux kernel>=6.19<6.19.6

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Remediation

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Fixed in 6.8.0-1058.61
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Fixed in 6.8.0-1058.61.1
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Fixed in 6.8.0-1029.30
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Fixed in 6.8.0-1057.58
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Fixed in 6.8.0-1060.64
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Fixed in 6.8.0-1032.33
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Fixed in 6.8.0-1026.30
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Fixed in 6.8.0-2049.50
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Fixed in 6.8.1-1055.56
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Fixed in 6.8.0-1060.63+fips1
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Fixed in 6.8.0-1062.69+fips1
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Fixed in 6.8.0-134.134+fips1
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Fixed in 6.8.0-1063.69+fips1

Event History

May 8, 2026

CVE Published

via MITRE·01:11 PM

Data Sourced

via MITRE·01:11 PM

Description

Data Sourced

via OSV·02:16 PM

DescriptionSeverityAffected Software

Data Sourced

via NVD·02:16 PM

RemedyDescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-43314?

CVE-2026-43314 has been classified with a medium severity level due to its potential impact on request leakage.

How do I fix CVE-2026-43314?

To fix CVE-2026-43314, you should update the Linux kernel (device-mapper) to a patched version that eliminates the fake timeout issue.

What types of systems are affected by CVE-2026-43314?

CVE-2026-43314 affects systems running the Linux kernel, specifically those utilizing the device-mapper.

Is CVE-2026-43314 remotely exploitable?

CVE-2026-43314 is not considered remotely exploitable as it requires local access to the affected system.

What potential impacts does CVE-2026-43314 pose?

CVE-2026-43314 could lead to unauthorized information disclosure due to request leakage if left unaddressed.

CVE-2026-43314: dm: remove fake timeout to avoid leak request

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2026-43314?

How do I fix CVE-2026-43314?

What types of systems are affected by CVE-2026-43314?

Is CVE-2026-43314 remotely exploitable?

What potential impacts does CVE-2026-43314 pose?

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